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MLA Citation: birch pollen on surface of water in spring season - birch and alder pollen is natural source of seasonal pollen allergy (oral allergy syndrome). Stock Photo. iPHOTOS.com, Authentic Creatives, LLC, 01-06-2016, https://iphotos.com/download.php?iid=1250294&tl=photos. Accessed 23-09-2024.